Transcript Document

Differentiating CAPD from Auditory Neuropathy Spectrum Disorders
Charles Berlin, Ph.D.
July 2011
Test
Normal
hearing and/or
central
auditory
processing
disorder in
simple form
(normal
audiogram)
Outer hair
cells damaged
(audiogram
from normal to
65 dB in pure
form)
Inner hair
cell/nerve fibers
damaged
(audiogram
from normal to
total deafness)
Conductive
obstruction
in the outer
or middle ear
(bone
conduction
better than
air
conduction)
Tymps/Reflectance
A
A
A
B and C
Reflexes
Normal levels
75-95 dB
Normal levels
75-95 dB
Elevated or
absent
Absent or
elevated
Emissions
Present
Absent
Present or at one Absent or
time present
elevated
ABR five-wave
complex
Normal to all
stimuli down to
Normal until
threshold
Absent and/or
desynchronized
Shifted to
right